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Variable Blue Stragglers in M67
Variable Blue Stragglers in M67

... and S1284; physical parameters for the 3 variable BSs are determined, evolutionary status and probable formation mechanism are discussed; S1036 and S1082; waiting for more observations. ...
Module 11.1.1: Galaxies: Morphology and the Hubble Sequence
Module 11.1.1: Galaxies: Morphology and the Hubble Sequence

... universe   now,   and   their   masses   range   from   hundreds   of   million   to   maybe   trillion   solar   masses,  containing  up  to  couple  of  hundred  billion  stars.     [slide  3]  The  first  thing  that  any  empirical ...
The discovery based on GLIMPSE data of a protostar driving a
The discovery based on GLIMPSE data of a protostar driving a

... these also show similar bipolar morphologies in the infrared (Balick et al. 1987; Kwok 1993). Recombination and forbidden line emission from hydrogen and metals, especially Hα and [Oiii], are significant spectral features of a PN in the optical (Osterbrock 1964; Miller 1974). However, very weak Hα a ...
Kinematic signature of an intermediate
Kinematic signature of an intermediate

... & Hamilton (2002) presented scenarios for the capture of clusters by their host galaxies and accretion in the galactic disk in order to explain the observed bright X-ray sources. Our goal in this paper is to study the globular cluster NGC 6388. This cluster is located 11.6 kpc away from the Sun, in ...
Evolution of galaxy morphology - Lecture 1 - NCRA-TIFR
Evolution of galaxy morphology - Lecture 1 - NCRA-TIFR

... debate, although Curtis was right. 1925: Hubble discovered Cepheids in the Andromeda galaxy Extragalactic astrophysics < 100 years old! ...
the origin of the hubble sequence - Yale Astronomy
the origin of the hubble sequence - Yale Astronomy

... The timescale for gravitational instability or swing amplification effects is approximately τ ∼ c/πGμ, and thus it depends on both the velocity dispersion c and the surface density μ of the gas. Two possible limiting cases have been considered by Larson (1988, 1992) in discussing the implied paramete ...
Stellar populations in the nuclear regions of nearby radio galaxies
Stellar populations in the nuclear regions of nearby radio galaxies

... resolution in the blue and l7900–9400 A the red. In the 1997 run, in which we assessed the viability of the project, we used the R600B and R600R gratings instead. This setup  and l8510–9320 A  range in the blue and covers the l3810–5420 A red arm, at 2.6- and 1.7-Å resolution respectively. Just o ...
The history of a discovery - Institut d`Astrophysique Spatiale
The history of a discovery - Institut d`Astrophysique Spatiale

... • the heavy elements (and associated dust) abundance in the universe is increasing with time • a naïve view would thus predict a decreasing FIR/visible ratio with redshift • a few galaxies had been shown to have a large ratio but the bulk of the galaxies were expected to have rather small one (a few ...
Gal - University of Rochester
Gal - University of Rochester

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ISR_hst2galign - Space Telescope Science Institute
ISR_hst2galign - Space Telescope Science Institute

... points of reference for data sets taken over extended epochs. Therefore, we often must rely on galaxies. In the initial finding stage, since we knew nothing about each galaxy’s size and shape, we used crude centroids to estimate their positions. As is true for stars, it is possible to get much bette ...
uncorrected page proofs
uncorrected page proofs

... Shapley argued that the Milky Way was the entire universe and all the nebulae were therefore to be found within it. Curtis argued that some nebulae were actually separate galaxies of stars, well outside the Milky Way. For Curtis to be right, these galaxies must lie at enormous distances from the Ear ...
File - Astronomy Home
File - Astronomy Home

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KINEMATIC MEASUREMENTS OF GAS AND STARS IN SPIRAL
KINEMATIC MEASUREMENTS OF GAS AND STARS IN SPIRAL

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... In this context, the ΛCDM paradigm has enjoyed great success by explaining a large number of observables, such as the temperature fluctuations in the radiation we receive from the early Universe (i.e., the Cosmic Microwave Background), the accelerated expansion of the Universe and the growth of stru ...
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Manuscript - Kapteyn Astronomical Institute
Manuscript - Kapteyn Astronomical Institute

... masses. Although the observed b/a is not a measurement of the intrinsic shape of the disk, if one assumes random orientations on the sky, the two are directly related. In our literature search we have carefully selected isolated late-type galaxies to avoid any morphology-luminosity trend that may be ...
The Consellation Virgo
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... a) measuring distances with Cepheid variable stars. b) identifying the mass of the Galaxy’s central black hole. c) determining the masses of stars in an eclipsing binary system. d) using spectroscopic parallax to measure distances to stars. ...
black holes are created when stars collapse and die from burning its
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... • once all the starts burn out in 100000000000000000000000000000000000000000000000000000000000000000 years (100 vigintillion years), then black holes will all eventually evaporate from the lack of energy provided • the physical characteristic of a black hole are defined by its size, mass, and color ...
A very massive runaway star from Cygnus OB2⋆
A very massive runaway star from Cygnus OB2⋆

... star dates back to van Buren & McCray (1988), no spectral classication is available in that work. Subsequent papers by van Buren et al. (1995) and Noriega-Crespo et al. (1997) refer to the star as a unspecied B-type but do not report dedicated observations, and no other spectroscopic classication ...
THE OUTER STRUCTURE OF GALACTIC DISCS 1
THE OUTER STRUCTURE OF GALACTIC DISCS 1

... In none of the 193 galaxies analyzed have we found a sharp cut-off, equivalent to van der Kruits truncations [9], although Type IIs do show steeper outer slopes. Any theory of disc formation must explain this, but must also explain the other types, and any relation between them and overall galaxy mor ...
cast-of-characters
cast-of-characters

... self-sufficient, and sterile. This experiment, however, has one minor flaw, and that is photosensitivity. [Ratchet] - Now a retired hero and former member of the Q-Force, the lombax spends the majority of his time at home, contemplating the past and sometimes about his abrupt decision to distance hi ...
The star-forming environment of an ultraluminous X-ray
The star-forming environment of an ultraluminous X-ray

... a distance modulus d M = 30.0 mag (corresponding to a distance of 10 Mpc) throughout our analysis. We also corrected the theoretical tracks for the line-of-sight Galactic extinction E(B − V ) = 0.018 (Schlegel, Finkbeiner & Davis 1998). We are aware that all the available sets of evolutionary tracks ...
The Mass of Jupiter Student Guide
The Mass of Jupiter Student Guide

... Question 3: To use a formula, we need measurements of time, distance, and mass to be written in consistent units. If we have G in the standard metric units as above, in which units do we need to put the other variables? G is in units of m3 / (kg s2) P should be in units of M should be in units of m ...
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Cosmic distance ladder



The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.
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